Pressing-machine mechanism



,July 12, 1927'. 1,635,6rq

E. DAVIS PREssING MACHINE MECHANISM Filed Aug.5. 1924 2 sheets-Sheet 2 fr@ 4/ K I N VEN TOR.

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ATTQRNEY5 Patented July 12,` 1927.

UNITED STATES PATENT OFFICE.

ERNEST DAVIS', OF CHICAGO, ILLINOIS, ASSIGNOB, BY MESNE ASSIGNMENTS, T0 THE PBOSPEBITY COMPANY, ING., 0F SYBACUSE, NEW YORK, A CORPORATION OF NEW vom;

" PBESSING-MACHINE MECHANISH.

` This invention relates to pressing ina-I' rhines, such as garment and laundry pressing machines, of the type in which the press' head is closed by a mechanism including-a crank or other rotary eccentric means to open and close the movable press head and has for its object a motion transmitting mechanism by which the press is moved with accelerated inotionfrom its openposition to an intermediate position, and with decreasing motion-from such intermediate positiony to final pressing position, or ementially a mechanism by which the press is closed by a decreasing leverage between the driving and driven parts, so that speed is translated into power at the beginning and end of the opening and closing movements and particu' larly at the end of the closing movement, and also owing end of the closing movement the press is closed with relatively great pressure without increasing the load suddenly on the prime mover. Also the leverage ratio at the start of the closing movement of the press is small, so that, the press head starts without throwing a load suddenly von the prime mover. A

The invention consists in the novel fea,- tures and in the' combinations and constructions hereinafter set forth and claimed.

In describing this invention reference is had to the accompanying drawings inwhich like characters designate corresponding parts in all the views. v

' Figures 1 and 2 are respectively elevations of a pressing machine embodying my invention, the ress being shown as open in Fig. 1, and) as closed in Fig. 2.

Figure 3 is a detail view of the half revolution or periodic clutch mechanism.

Figure 4 is a detail view ofthe lever for operating the clutch mechanism.

Figure 5 is a diagrammatic view illustrating the the elliptical gears, during a quarter revolution of the'driving shaft.

This pressing machine comprises generally cooperating pressing elements, one movable toward and from the other, and means for actuating the movable element, including rotary eccentric means, constructed to move from starting positionwhen the press is o en with lowY leverage ratioand with acce erated motion and increased leverage to the leverage ratio at they ressure line, and the position of ratio to intermediate position and with del creasing motion and leverage ratio from intermediate position to its osition when the press is in final closed position.

I have here illustrated my invention, as

embodied in that type of pressing machine including a stationary pressing element or buck 1, a movable element or head 2, movable toward and from the buck 1, the buck'l being mounted on a suitable frame 3, and the head 2 being carried by a yoke or lever 4 pivoted between its end at 5 to a standard 6 rising from `the frame, and the head 2 being carriedby the frontarni of the lever, and the actuatingmeans being connected to the rear arm of the lever. l In the machine here illustrated this actuating means comprises a toggle including links 7, 8, pivoted together at 9, the link 7 being pivoted at 10 to the rear arm of the lever 4, and the link 8 being pivoted at 11, to the base of the. machine, the toggle being movable from its folded position shown in 1, to straightened position shown in Fig. 2. The toggle is actuated by a crank, and a connecting rod between the crank and the toggle, the crank being in nearl a straight line with the connecting rod w en the crank is in its starting position, and at the end of its throw or after it has made a half revolution. By the' use of. an ordinary crank mechanism the leverage ratio remains the same'and hence throws unequal loads back oii the prime mover as a start and stop electric motor or a start and stop shaft, especially during starting when the prime mover must overcome the inertia of the movable element and the motion transmitting mechanism and at the end when inal pressure is being applied and again when starting to open the press. Hence the prime mover, owing to the hivh leverage ratio, is ineffective to apply fu power and heavy pressure when the press is closed.

By my invention, owing to a change of the leverage ratio between the driver and the crank shaft speed is converted into power as the press approaches closed position. This change 'of leverage is in effect the same as `starting with a comparatively short crank, gradually lengthening the crank, and then gradually decreasing the length of the crank.

In the illustrated embodiment of my in- -driver to the crank shaft.

12 designates the drive shaft;` having an elliptical ear 13 thereon, 14 designates the crank shaft, having a crank 15 thereon, and also an elliptical gear 16, the elliptical gear 16 meshing with the gear 13, the gears being normally arranged with the minor axis of the drive gear 13 in line with the major diameter of the elliptical gear 16, and the major diameter of the gear 16 being arranged at an angle to the crank 15.

17 is a connecting rod connecting the crank 15 and the joint 9 of the toggle. The crank 15 is arranged, so that, it is substantially in alinement with the connecting rod at the beginning and end of the throw thereof. That is, it is in the position shown in Fig. 1, at the beeinning of the closing movement, and in t e position shown in Fig. 2 at the end of the closing movement of the press. Thus the gear or leverage ratio between the gears 13 and 16 is normally, say, 1 to 3, and during the half revolution the gears move gradually from 1 to 3 to 3 to 1, and back from 3 to 1 to 1 to 3, as shown in Fig. 5. The par ratio being low, say 1 to 3 when the al heavy pressure is a. plied no sudden strain is thrown back on tie power and final heavy pressure is gained by transfer into power and a heavy fly wheel is not necessar the operation of the prime mover is uni orm and they consumption of current less when an electric motor is used as a prime mover.

The sha-ft 12 is mouted in a suitable housing 18 supported by the main frame, and the crank shaft is also mounted in suitable bearings carried by the main frame. The shaft 12 is driven by a constantly running electric motor and eriodic or half revolution clutch mechanism between the motor and the shaft 12. 19 desi ates the motor which may be of any suitab e form, size and construction.` 20 is the armature shaft of the motor, it having a worm 21 thereon which meshes with the worm ear 22 mounted on the shaft 12 to rotate a out the same. This gear 22 is located within the housin 18.

The periodic clutch mechanism ere shown comprises a clutch section which is shiftable manually -to its in position and automatically to its out position at the end of each half revolution of the shaft 12. The clutch mechanism here shown includes a shiftable section 23 mounted'on the shaft 12 to rotate therewith and to shift axially thereof, pins 24 movable by the section 23 into and out of holes 25, in the web of the gear 22, a disk 26 mounted on the shaft 12 and having holes for guiding the pins 24, a pressure ring 27 thrusting against shouldersf28, on the pins, light springs 27' betessere tween the pressure ring and the shiftable section 23, and 'a main spring 23a acting on the section 23 to thrust it out The section 23 is operated to its in position by a shifter arm 29 mounted on a rock shaft 30 journalled in the casing 18, the arm 29 thrusting against the hub of the section 23 and a second rock arm 31 mounted on the shaft 32 carried by the upper part of the frame 3, andihaving an arm 33 thereon, coacting with the arm 31, and a handle lever 34 mounted on the shaft 32. The

arm 33 is shaped to house the lever 31, and

is provided with a shoulder 35, coacting with the shoulder 36, on the lever 31, these shoulders 35, 36, being so arranged that depressing of the handle 34 causes the shoulder 35 to thrust against the shoulder 36 and operates the arm 31, so that, the rock shaft 30 is rocked to cause the shifting lever 29 to throw the clutch section 23 to the left against the action of the main spring 23, thus moving the pins 24 into the holes 25 fixed to the worm gear 22., After the arm 31 has been moved, the shoulder 35 asses over theshoulder 36, so that, the c utch cannot be held in h the operator holding his hand on the han le 34. When the operator releases his hand from the lever 34 it returns to its normal position under the Wei,ht of the arm 33 or by a spring, and t e shoulder 35 ratchet-.s past the shoulder 36. The light springs 27 permit the pins to yield momentarily when not in alinement with the holes 25. Q

The clutch is held to its in osltlon by a. cam rim 38, mounted in the ousin 18 concentric with the shaft 12 and fol owers 39, on the section 23 and coacting with the cam 38, the cum being formed with diametrioally opposite notches 40 for receiving the followers and with plain faces 41 between the notches.

The followers are normally arran ed in the notches. Upon depression of the andle lever 34 the section 33 is shifted to the left to the in position against the action of the sprin 23", and the pins 24 are shifted into the oles 25 in the worm wheel 22. Hence the shaft 12 commences to rotate with the Worm wheel 22, carrying the follower on to the high or plain face 41 of the cam,

so that, the clutch section 23 is held in by the lain faces of the cam during a half revo ution or until the followers again come into alinement withthe notches, whereupon the spring 23m shifts the clutch section 23 to the right to its out positiondisconnecting the shaft 12 from the' worm' wheel4 22.

The construction of this clutch mechanism forms no part of this invention.

What I claim is: l 1. In a pressing machine, cooperating ressing elements, one movable toward and om the other, and means for actuating the ment when the press is open and when the press is closed, an intermittently rotatable drive shaft, an elliptical gear mounted on `the crank shaft with its major axis at an angle to the radius of the crank, an elliptical gear mounted on the drive shaft and meshing with the former elliptical gear, the gears beingnormally arranged with the minor diameter of the ear on the drive shaft in line with the maior diameter of the gear on Athe crank shaft, and means for causing the driving shaft to intermittently make half revolutions.

2. A pressing machine, comprising cooperating pressing elements, one movable' to# ward and from the other, means for actuating the movable element, com rising a tog- Y l lgie movable into straightene position to close the press, a crank shaft having a crank thereon, a connecting rod connecting the crank and the toggle, the connecting rod and the crank being movable into a straight line to close the toggle to a substantially, straight line, an elliptical gear mounted on the crank shaft, with its major diameter at an angle to the vradins of the crank an intermittently rotatable drive shaft, and an elliptical ear thereon meshing with the former elliptical gear thereon, the elliptical gears being normally arranged with' the minor diameterl axis of the driving ear in line with. the major diameter ofthe riven gear, and means for causing the drive shaft tovmake -a half revolution during cach operation.

In testimony whereof, I have hereunto n signed my name' at Syracuse in the county ew York, this` i of Onondaga, and State of," 24th day of July, 1924.

EaNEs'rf-Davrs.' i 

